ENH: np.loadtxt returns object instead of array

[aa452948257]

Describe the bug

np.loadtxt returns Object but array.

To Reproduce

To help us to reproduce this bug, please provide information below:

import numpy as np
import xorbits
a = np.random.rand(5, 5)
np.savetxt('a.txt', a, fmt='%0.8f')
np_file = xorbits.numpy.loadtxt('a.txt')
print(np_file)

The output:
Object <op=RemoteFunction, key=d40f45e7cf5fa8e85376c3c14d7f6fd3_0>

Expected behavior

A clear and concise description of what you expected to happen.

[[0.70548155 0.92921275 0.57759417 0.28360752 0.25908658]
 [0.04388419 0.38940381 0.86247433 0.84509193 0.98603179]
 [0.1442014  0.15766898 0.12828645 0.75014494 0.28737759]
 [0.62665658 0.72180532 0.71792222 0.34275616 0.81105527]
 [0.05881193 0.97348195 0.12146659 0.51580312 0.68174111]]